In Fig. REF , to illustrate the parameter space favored by the constraints from the \(S\)  and \(T\)  parameters, we show the \(\chi ^2\)  values for the \(S\)  and \(T\)  parameters with the correlation coefficient \(+0.92\)  [1]} as a function of the mass of \(H_2\)  with \(\alpha _3=\pi /4\ ({\rm red\ curve}),\; \pi /2.1,\ ({\rm blue\ curve})\; \pi /2\)  (green curve).
The other parameters are taken as
\(&t_{\beta _{1}} =10\;,\quad t_{\beta _{2}} =2\;,\quad M^2_{12}=M_{13}^{\prime 2}=M_{23}^{\prime 2}=(500\ {\rm GeV})^2\;,\lambda _{10}=-0.45\;, \\&\gamma _+=\frac{\pi }{2}\;, \quad \alpha _1=\beta _1\;, \quad \alpha _2=\beta _2\;,\\&m_{H_3}=600\ {\rm GeV}\;,\quad m_{H_1^\pm }=600\ {\rm GeV}\;,\quad m_{H_2^\pm }=500\ {\rm GeV}\;.\) 
